hi everyone, i have a little problem on my hands and im unsure on how exactly to handle this so hopefully some of you can help, my sister currently fell onto hard times and her and her shiba inu jerry have moved back in with my 7 month GSD ellie and myself and my parents. well maybe a month back when ellie and jerry first met, the first enconter did not go well jerry lunged and bit her face, well needless to say we kept them seperated for some time and we would kind of acclimate them to one another slowly but surely things seemed to get better to the point where they could be together in the same room without any incidents well now that some time has passed ive noticed jerry has some serious aggression issues not only is it food but its toys and territory, and not just his toy and territory but hers as well! and now its come to a point where its starting to effect our training because ive already cleaned up half a dozen of ellies messes because she doesnt want to go the door and tell me she needs to go out because jerry will nip at her on her way through the kitchen, or if shes at the top of the stairs and she wants to come down jerry will wait at the bottom of the stairs and growl and bark at her if she starts going down the stairs. the final straw happened not more than an hour ago, my nieces came in for a visit and natually ellie was riled up because people were here well in my attempt to get her off the couch and put her in a sit stay here come jerry barrelling through the kitchen into the living room and bit my hand that was holding onto ellie collar. so my major question is how do i work around jerrys agression with ellie or do i go over my sisters head and work with jerry myself on his agression issues any and all help is greatly appreciated!!!!